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ABS sensor repair

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tontoe
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ABS sensor repair

Post by tontoe » Fri Aug 16, 2019 12:26 pm

HELP!

The front left ABS wheel speed sensor on my 1990 2.0i 16V 4WS has failed.
It's open circuit from (I think) having touched the sensor ring due to the aluminium housing corroding/bulging.

I can't find a replacement here in the UK. I found, ordered and paid for one from Japan, only to get an email [and refund] saying the part was discontinued. Same happened with a parts distributor in the U.S.

I've tried car dismantlers here and abroad, and am drawing a blank. Found one at a breakers in Stranraer, this week but when I phoned they said it went for crushing last week :thumbdown: :thumbdown:.

As you all know, having the ABS light on means an MOT failure, and the car becoming, ultimately, junk.

I'm desperate to avoid this as I have lavished much time and money on the restoration.

Does anybody know if there is a sensor from another Honda model [or even a different make] that has the same specifications and would fit on the hub with the required clearance rom the sensor ring? I can splice the wire on to the existing lead & plug as it's only two cores, but what is important is the sensor end. Think we can clean up and and adapt the housing if necessary.

Or alternatively, does anyone know of anywhere that might be able to repair the existing unit? As it's open circuit, I presume the windings are damaged.

Scott560
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ABS sensor repair

Post by Scott560 » Fri Aug 16, 2019 1:08 pm

Have you got a picture of the sensor as it stands? or one from the other side?

Trouble is with a lot of online parts , generic images are used...

I suspect the sensor itself is the same as many hondas from that era, find a few cheap ones on ebay and have a look - I've got some spare 5th gen rear ones. I guess the only thing that is really important is the diameter. Its offset and how its positioned in the sensor i guess is to some extent adjustable/bodgeable.
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tontoe
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ABS sensor repair

Post by tontoe » Fri Aug 16, 2019 8:39 pm

Thanks :)
I'll get a picture of the existing sensor when we remove it next Thursday. I'll post it then with some measurements to see if the diameter might match - guess it's the same technology until early 2000s...

EddieMunster
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ABS sensor repair

Post by EddieMunster » Wed Sep 04, 2019 7:16 am

tontoe wrote:
Fri Aug 16, 2019 8:39 pm
Thanks :)
I'll get a picture of the existing sensor when we remove it next Thursday. I'll post it then with some measurements to see if the diameter might match - guess it's the same technology until early 2000s...
You need to check the resistance of the sensor, see what the ECU is expecting compared to what the sensor is sending out. I had the same issue, albeit 4g and on the rear, but if you can adapt the housing to accept a new sensor (with the same resistance band) then there'd be no reason why it wouldn't work. Indeed, I did just that, but in the end I found out my problem wasn't that I'd bought faulty second hand sensors it was that the gap between sensor and castelation ring was too great; cleaned the hub, sensor worked perfectly. That particularly "finding" took 6 months to sort, having tried everything you can possibly imagine, so don't assume your current sensor is junk. Open circuit can mean a break in the cable between sensor to plug, from plug to the ECU, so definitely investigate that too.

Stupid question, but, have you tried Honda yet? I've bought parts for my 4g/5g that you'd think would no longer be available but Honda had them on next-day!
4g 2.2 in Silver, 5g 2.2 Motegi in Blue.

tontoe
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ABS sensor repair

Post by tontoe » Wed Sep 04, 2019 11:51 am

Thanks :)
This is really useful.
Yes my first port of call was Honda - first in the UK. The part was listed by dealers in Japan and the USA but after I ordered I received emails saying it was discontinued.
We stripped some insulation to check the wires on the existing sensor as close to the head as possible, and it was still open circuit, so the break is somewhere inside the sealed unit.
I've managed to find a used sensor off a 4th gen which will arrive next week, which looks very similar [same mounting hole spacing] but I guess we'll need to shim it out to get the same gap from the ring. We'll measure the resistance of the new unit in comparison with one of the other, working ones, but I guess we'll need to account for cable length too?
Thanks again for taking the time - I'll report back.
Meanwhile, I have some pics of the one we took off. Just need to work out how to upload them...

EddieMunster
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ABS sensor repair

Post by EddieMunster » Fri Sep 06, 2019 6:03 pm

tontoe wrote:
Wed Sep 04, 2019 11:51 am
I guess we'll need to shim it out to get the same gap from the ring. We'll measure the resistance of the new unit in comparison with one of the other, working ones, but I guess we'll need to account for cable length too?
The cable length should be fine, the only issue may be the resistance expected by the ECU; it's definitely different from 4g to 5g, that much I do know, but I can't comment on 3g to 4g. Have a look in the manual, there's a link on this site to them (which is how I know there's a difference :D)
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tontoe
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ABS sensor repair

Post by tontoe » Fri Sep 06, 2019 8:50 pm

EddieMunster wrote:
Fri Sep 06, 2019 6:03 pm
the only issue may be the resistance expected by the ECU; it's definitely different from 4g to 5g, that much I do know, but I can't comment on 3g to 4g.
Thanks - that is really useful to know. Whereabouts in the manual(s) would I find the expected resistance(s)?

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